Pipe-tapping attachment



I." a w l Rw l n. a

PIPE TABPING ATTACHMENT.

2A SHEETS-SHEET 1.v

FILED MAR. 31,1921.

INVENTOR.

ATTORNEY.

Patented Jan. 16, 1923.

UNITED STATES) i JOHN W. FLOWER, OF DETROIT,

`. intatti A i 'PIPE-TAPPING ATTACHMENT.

Application led March 31V,

To all whom it may concern.'

Be it known that I, JOHN W. FLOWER, a Y citizen of the United States,and residing at Detroit, in the county ofi/Vayne and State V Michigan,have inventedy a new and Im! proved Pipe-Tapping Attachment, of, which`the following is a specification. n This invention relates to means forcutting openings in tva-ter and 'gais street mains, and other largepipes vfor tl'ielpurposeof attaching branch pipes, and its Objectis Etoprovide a devicegof this lcharacterrv'vhich shall have greatl strengthand Wear' resist,- ing power and which shall have'a self freg-y ulatingfeed so as -to avoidv breakage of 'they` cuttingtools. 'A

'The' device shown inthe accompanying" drawing is adapted to be fused inconnection with the 'pipe connection shown infmy PatentfNo. 1,278,128,dated September 10,1918, and, its purpose is to cutyan opening into thepipe or tap the( pipe'fas such Work isv usually called, in alinementwithfthe valve 4 shown by` this patent, the present device being4attached to `the outer flange ,of the l valve before the valve isopenedandthe cutting tools being` movedintoffe'ngageinent With the pipeland ahole cut yin the pipe bysaidlcutters, after which the cutters andythe cutout portion of the pipeare Withdrawn, the' valvel closed, ,thepipe cutter .removed and a branch pipe'isattached to thevalve.

This invention consists in the details yof construction illustratedinthe accompany` ing drawing and particularly pointed outin.

the. claims.

In the accompanying drawings, FigQlwis a centrall longitudinal sectionof Imy improved pipe perforating machine. Fig. 2 p is a section on-theline 22of Fig. 1. Figs 3 is an elevation ofthe main feedl gear. Figs. 4,5 andf aresections on the lines partsthroughout thevseveral views,

Similar reference characters refer to like be secured to theouter flangelof the valve f bodyA lshown in my above 'named prior',A patent byboltsinserted 1n the notches 6 in i921. serial No. 457,252. a

' the flange 7. yThe hnbfiicon'nects to the spool 8:l which has a'jstuffing bei; 9 in its head 10 to prevent leakagel around the `spindle.from the main being tapped.

The cylinder l2 is of tvvodiameters "andl has avpistonlfin `its smallerportion ser-f` cured tothe spindle 1 in any desired manner, appui 14being shown, andthe dia `v phragm 15 at yits-,smaller end 4carriesabearlng'bushing lfor the spindleQ; It isfevi-j' dent that the bushingmightnbe in thehead 10 and'the stuliing MICHIGAN, AssIGNoR 'ro HERBERTvv, "STANTON, or DETROILJMICHIGAN. s Y

rbox Sin thediapliraginf 15. kThis cylinder-'is filled with oilxand a lsecond. piston 17 in the larger vkportion fofy the 'cylinderhas astufiingabox" 18 to pre= i ventleakage of oil around Lthe spindle. Bothpistons may 'bel ,formedv Iwith circumferential prevents'the pistoni?from turning.Y

packing grooves, "Thex'outer, headfof the` cylinder vhas, a central hub19 and tvvo flanges' 20 and 22`,fland a pin 23 .connected to the piston17 extends through afholevinw. the ,flang'ef20 and,` is slidablev.therein and,

The' plStOn is Secured the uur.

threaded inner sleeve 24 which V.extends With'-` I intheinternallythreaded outer sleevel 25;l The spindle 1 has a key-'Way 26inWhiCh is slidable Aa key. 27- extending `from-fthe hubV of thegearj28, andthisgearis seci'uedr to i* the flange 29 on the outer end ofthewoouter sleeve 2b/which is rotatably mounted linthe outen'cylindervhead. y

a The flange 22v is` extended laterally; as shovvfn in Fig. 4 and to itis secured a Aframe 31, shown inFig. 2, This frame is -formed lWithfabearing 33 for the spindle 1 .andavith bearings 34 for the stub shafts35 on the Worrnmge'ars 36. l.It is' byA means of bolts 32.

also formed lwith bearings for the` drivmg shaft .3S which carries theWorms 89..

whichk mesh with the wormgears 36. Pins 41 are mounted in the Wormgearsy 36.. and

mesh with the teeth 42 ofthe gear 28 and these pins are also mountedinfthe ydisks* 43 that rotate inthe bearings44 formed 4in lthe-flange22.4 The' end. thrust of the sleeve; 25y and"y main gear 28`inay `beresisted by al thrust bearingfconsisting of :rings 45 and ico balls 46.yAn eye 47 may` bey scr'evvedonto.- i

vicemaybe lifted thereby. il j l They operation of this device'is asthe-outer end of the spindle. so ,thatthisdel routes;

After the flange hasgbeen secured to the lianee of the valve slioivn inm 'f former oat.-

ent, the shaft 38 is turned to turn the worm gears 36 and the main gear2S together with the sleeve 25, which causes the sleeve 2-l and. thepiston 17 attached thereto to move toward the pipe being tapped. Thespace in the cylinder 12 between the pistons 17 and 13 having beenpreviously filled with oil, the movement of the piston-17 causes agreater longitudinal movement of the piston 13 and of the spindle 1 andthe tools connected thereto, the tools moving' down through the openedvalve until the drill engages the pipe to which the valve has beenattached. A hole is soon drilled and, threaded by means olf the threadsil on the drill. after which a large holo is cut by the teeth of thecutter 2. After the opening has been cut, the shaft 38 is. reversed andthe spindle l, cutter 2 and drill 3 with the cut out section of the pipehanging thereon are withdrawn from the valve, after which that isclosed. lThe threads e on the drill prevent the cut outV Section otvpipe slipping oli' as would be the case it the drill were smooth. Y

The advantage of the two pistons 13 and 17 and the oil between them isthat they relieve the cutter 2 ot the absolute necessity of movingforward when an unusually hard spot in the metal being cut is reached,which movement is communicated to the piston 17.

by the screw threaded sleeve 25. While liquids are generally consideredincompressible, inpractice there is so much air mixed with the liquidand so much tree air in the cylinder 12 with the liquid that the spindle1 may be permitted to turn Without moving longitudinally, the resultbeing a mere accumulation of pressure.

The ratio of diameters of the two parts ot' the cylinder 12 willdetermine the ratio of the movements of the pistons and may be varied asdesired. So may also the other details of construction without departingfrom the spirit of my inventionas set forth in the following claims.

I claim zv 1. A main tapping machine comprising a cylinder having partsot two diameters, a piston in each part of the cylinder, said cylinderbeing lled with liquid between. the pistons, a spindle connected to onepiston and slidable within the other, means to rotate the spindle andforce one piston toward the other, and cutting tools mounted on one endof said spindle.

2. A main tapping machine comprising a cylinder having parts of twodiameters,

piston in each part ot the cylinder, said cylinder being filled withliquid between the pistons, a spindle connected to the piston ot smallerdiameter and slidable withiny the piston of larger diameter, means torotate the spindle and to force the piston ot larger diameter toward theother comprising a gear with liquid between the pistons, a spindle`connected to the piston of smaller diameter and slidable within theother, the head at vthe smaller end of the cylinder beingtormed with a`bearing bushing for said spindle, means to prevent the'piston oit largerdiameinternally threaded sleeve journaled within the head at the largerend ot' the cylinder,` an externally threaded sleeve 'screw threadedwithin the iirst andconnected to the piston of larger diameter, andmeans to rotate said ter from rotating within the cylinder au internallythreaded sleeve to force the pistony l of larger diameter toward theother.

4. A main tappingmachme comprisinga cylinder having parts ot twoVdiameters and 1 heads for said cylinder, a piston in each part of thecylinder, said cylinder being lil-led with liquid between the pistons, aspindle connected to the piston or' smaller diameterv and slidablewithin the other, the head at the smaller end of the cylinder beingformed with a bearing bushing for said spindle, means to prevent thepiston oflarger diameter from rotating within the cylinder, vaninternally threaded sleeve journaled within' the head at the largerend'of the cylinder, an

externally threaded sleeve screw threaded within the first and connectedto the piston of larger diameter, and means to rotate said internallythreaded sleeve to torce the piston of larger diameter toward the other,comprising a maingear slidable on the spindle and rotatable therewithand attached to said internallyA threaded. sleeve, a worm gear. a wormto drive the same, and pins mounted in s aid worm gear to engage theteeth ot' the main gear.

llO

5. A main tapping machine comprising a cylinder having parts of twodiameters `and heads for said cylinder,` a piston in eachf part of thecylinder, said cylinder being filled with liquid lbetween the pistons,Aa

spindle connected to the piston of smaller diameter and slidable withinthe other, the

head at the smaller end of the cylinder ,being formed with a bearingbushing for said spindle, means to prevent the piston'oiV largerdiameter from rotating within the cylinder, an internally threadedsleeve journaled within the head at the larger end of the cylinder, anexternally threaded sleeve screw threaded within the first and connectedto the pistonof larger diameter, means -t'o rotate said internallythreaded sleeve to force the piston of larger diameter toward the other,a spool attached to the small end of said cylinder and having a headprovided with a stuffing box, a connector hub secured to said spoolhead, and cutting tools mounted i on said spindle Within said hub.

6. A main tapping machine comprising a cylinder having parts of tWodiameters and heads for said cylinder, a piston in each part of thecylinder, said cylinder being filled with liquid between the pistons, aspindle connected to the piston of smaller diameter and slidable Withinthe other, the head at the smaller end of the cylinder being formed witha bearing bushing for said spindle, means to prevent the piston oflarger diameter from rotating Within the cylinder, an internallythreaded sleeve journaled Within the head at the larger end of theoylinder,

an externally threaded sleeveserew threaded Within the first andconnected' to` the piston of larger diameter, means to rotate saidVinternally threaded sleeve to force the piston of larger diameter towardthe other, comprising a main gear attaehedto said internally threadedsleeve and slidable on the spindle and rotatable therewith, meansmounted on the spindle to prevent endWise JOHN W. FLOWER.

